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Darwin Publicly introduced the revolutionary theory on evolution in a letter at a meeting of the Linnean Society. He published a detailed explanation of his theory in his best-known work, On the Origin of Species by Means of Natural Selection. There are 4 theories of evaluation all together. Resources:
Biography.com Editors, "Chares Darwin", A&E Television Networks, April 2, 2014. -
Charles Darwin's theory has 4 sections. 1.) He suggested that new species are the result of extreme within-species variations. Individual changes become so extreme that a new species buds off from an existing one with either physical isolation or environmental pressure. https://www.youtube.com/watch?v=vnktXHBvE8s Resources:
Darwin C., "The Origin of Species", New York: Avenel Books; 1979 (google Scholar) -
Darwin's theory was main up by 4 theories. This #2. Charles Darwin's theory of natural selection was based on many key observations. Traits are often heritable. In living organisms, many characteristics are inherited, or passed down from parent to child (offspring). Darwin knew this was the case, even though he did not know that traits were inherited by genes. https://www.khanacademy.org/science/ap-biology/natural-selection/natural-selection-ap/a/darwin-evolution-natural-selection
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Theory #3 of Darwin's theory. The meaning behind this is...Organisms produce more offspring than actually survive. Organisms can die from many causes; diseases, starvation, and being eaten, among other causes. The environment can not support every organism that is born. Darwin stated, "population sizes to remain stable, many offspring must die".
I didn't find the cite info so I copied the address.
https://necsi.edu/how-does-evolution-occur
https://necsi.edu/how-does-evolution-occur -
This is Darwin's #4 of his theory. Darwin's fitness is defined based on the specimen's ability to reproduce and generate viable offspring. Essentially, the fitness of the individual is based on its ability to pass genetic information on to the next generation, as opposed to any physical characteristics or traits. I looked for the info to cite off my sources off events, I found no info and I ran out of words to type. https://lisbdnet.com/what-does-darwinian-fitness-measure/